Shape-Selective Oriented Cerium Oxide Nanocrystals Permit Assessment of the Effect of the Exposed Facets on Catalytic Activity and Oxygen Storage Capacity

Abstract

The catalytic performance of a range of nanocrystalline CeO2 samples, prepared to have different morphologies, was measured using two accepted indicators; oxygen storage and diesel soot combustion. The same powders were characterized in detail by HR-TEM, XRD, XPS, and Raman methods. The study demonstrates that activity is determined by the relative fraction of the active crystallographic planes, not by the specific surface area of the powders. The physical study is a step toward quantitative evaluation of the relative contribution to activity of the different facets. The synthetic protocol permits fabrication of CeO2 nanostructures with preferentially grown active planes, and therefore has potential in developing catalytic applications and in nanocompositing.

Ceria-Coated Gold Nanorods for Plasmon-Enhanced Near-Infrared Photocatalytic and Photoelectrochemical Performances

“…In the HRTEM images, the shell obtained at the first hour is amorphous (Figure 2b). Considering the hydrolyzation of HMT during the hydrothermal reaction, the extension part stuck on the AuNR side may be Ce 3+ hydroxide, 46 which is verified 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 by the XPS Ce 3d spectrum ( Figure S6). In the second hour (Figure 2d), as the crystallization was arisen, some tiny crystals were emerged in the shell layer at 2 h. In addition, the contribution of Ce 4+ is appeared in the XPS Ce 3d spectrum ( Figure S6).…”

Tailoring the surface properties of cerium oxide nanoabrasives through morphology control for glass CMP

“…8 which gives new insight into the surface properties of the abrasives. 25 It is well-known that the presence of Ce 3+ in the uorite lattice generates oxygen vacancies to maintain a charge balance 35,36 as shown in eqn (1): The Ce 3+ content is estimated using the integrated area of each peak in the deconvoluted Ce 3d spectrum as 42.1, 31.4 and 22.2% for HT1, HT2 and AP respectively ( Table 1).…”

Ag/CeO2 Composites for Catalytic Abatement of CO, Soot and VOCs

“…Recently, ceria has attracted a growing interest as a component of materials for electrocatalytic applications [192,193]. The main reasons for this are its high oxygen storage and transfer abilities.…”

“…Silver was also shown to be a promising material for electrocatalytic applications [189][190][191]. Recently, ceria has attracted a growing interest as a component of materials for electrocatalytic applications [192,193]. The main reasons for this are its high oxygen storage and transfer abilities.…”